MATLAB: Switch Case Construction Code help

shapesswitch case construction

(Ajay deleted the question, so I (MF) am restoring it.)
I am trying to create a function that takes a cell array containing strings as an input. The string can be triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, or decagon. The output is the sum of the interior angles of the requested shape. If the input is not valid, the code should return a 0. The input should be able to handle cell arrays containing multiple strings and output the corresponding angles as a vector.
I thought I got it, but then I found out I am required to use "switch case" construction, which I have no idea how to do. I tried solving it twice, and both times i got errors. Here are the 2 codes I worked out: What am I doing wrong? I tried reading on switch case construction, and I don't get what's wrong with either code?!
switch InteriorAngle(input)
    case 'triangle'
        disp ('180')
    case 'square'
        disp ('360');
    case 'pentagon'
        disp ('540');
    case 'hexagon'
        disp ('720');
    case 'heptagon'
        disp ('900');
    case 'octagon'
        disp ('1080');
    case 'nonagon'
        disp ('1260');
    case 'decagon'
        disp ('1440');
    otherwise
        disp ('0');
end
CODE 2
function output = InteriorAngle(input)
n=input('s')
switch InteriorAngle
    case ('triangle')
        n=3;
        sum=(n-3).*(180)
    case ('square')
        n=4;
        dispsum=(n-3).*(180)
    case('pentagon')
        n=5;
        sum=(n-3).*(180)
    case ('hexagon')
        n=6;
        sum=(n-3).*(180)
    otherwise
        disp ('0')
end

Best Answer

switch input('InteriorAngle')
case 'triangle'
      disp ('180')
  case 'square'
      disp ('360');
  case 'pentagon'
      disp ('540');
  case 'hexagon'
      disp ('720');
  case 'heptagon'
      disp ('900');
  case 'octagon'
      disp ('1080');
  case 'nonagon'
      disp ('1260');
  case 'decagon'
      disp ('1440');
  otherwise
      disp ('0');
end
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